The Promoda 3.3 kV Vacuum Circuit Breaker (VCB) Switchgear Panel is a metal-clad, air-insulated medium voltage switchgear solution engineered for safe and dependable power distribution in industrial facilities, substations, and critical infrastructure.
Designed using a system-house engineering philosophy compatible with Siemens vacuum switching technology, the panel integrates high-performance vacuum circuit breakers with a fully compartmentalized metal-clad construction. This architecture ensures safe operation, extended service life, and simplified maintenance even in demanding electrical environments.
The switchgear is specifically optimized for 3.3 kV medium voltage networks, commonly used in industrial motor feeders, auxiliary power systems, and process industries. Each panel incorporates a withdrawable breaker truck mechanism that allows the circuit breaker to move safely between service, test, and isolated positions for inspection and maintenance.
Manufactured using precision sheet-metal fabrication, insulated copper busbars, and high-reliability vacuum interrupters, the switchgear complies with international performance standards including IEC 62271-200 for metal-enclosed switchgear and IEC 62271-100 for circuit breakers.
This panel is widely deployed in industrial power distribution systems, power plant auxiliary networks, and heavy manufacturing facilities, where operational safety and switching reliability are essential.
Key Highlights
Wide Voltage Coverage
Supports reliable switching for 3.3 kV medium voltage power distribution systems.
Withdrawable Breaker Design
Truck-mounted vacuum circuit breaker with service, test, and isolated positions for safe maintenance.
IEC Compliant Construction
Engineered according to IEC 62271-200 and IEC 62271-100 standards.
High Operational Reliability
Vacuum interrupters provide long electrical life and consistent switching performance.
Operator Safety
Mechanical interlocks and automatic shutters prevent unsafe switching operations.
Industrial-Grade Build Quality
Heavy-duty metal-clad construction engineered for demanding industrial environments.
Panel Architecture
The switchgear panel is divided into multiple independent compartments to improve safety and maintenance accessibility.
- Circuit Breaker Compartment
Houses the withdrawable vacuum circuit breaker mounted on a racking trolley. - Busbar Compartment
Contains insulated copper busbars designed for high current capacity and thermal stability. - Cable Compartment
Provides termination space for incoming and outgoing power cables. - Low Voltage Compartment
Includes protection relays, control wiring, meters, and auxiliary devices.
Major Components
- Vacuum Circuit Breaker
High-performance interrupter designed for reliable fault interruption. - Withdrawable Breaker Truck
Allows safe movement between service, test, and isolated positions. - Busbar System
High conductivity copper busbars supported by insulated busbar supports. - Automatic Safety Shutters
Metal shutters automatically close when the breaker is withdrawn. - Interlocking System
Mechanical interlocks ensure safe operation and prevent incorrect switching.
Materials and Finish
- Heavy gauge sheet-steel enclosure
- Powder-coated corrosion resistant finish
- Silver-plated electrical contacts for improved conductivity
- High-quality insulation materials for long-term electrical reliability
| Parameter | Specification |
|---|---|
| Voltage Range | 3.3 kV – 33 kV |
| Rated Current | Up to 3150 A |
| Short Circuit Breaking Capacity | Up to 40 kA |
| Short Time Withstand Current | Up to 40 kA for 3 seconds |
| Circuit Breaker Type | Withdrawable Vacuum Circuit Breaker |
| Internal Arc Classification | AFL / AFLR as per IEC 62271-200 |
| Operating Mechanism | Stored Energy Spring Mechanism |
| Panel Construction | Metal-clad, compartmentalized switchgear |
| Ingress Protection | IP42 / IP54 |
| Panel Height | Approx. 2200 mm |
| Control Wiring | FRLS copper wiring, ferruled and numbered |
| Applicable Standards | IEC 62271-100, IEC 62271-200 |
Safety and Operational Reliability
- Fully metal-clad switchgear enclosure providing complete segregation of internal compartments
- Automatic metallic shutters that isolate live contacts when the breaker is withdrawn
- Mechanical and electrical interlocking system preventing incorrect switching operations
- Internal arc classification available for enhanced operator protection
- Separate compartments for breaker, busbars, cables, and control circuits
Vacuum Switching Technology
- Maintenance-free vacuum interrupters
- Long electrical and mechanical life
- High switching endurance for frequent operations
- Stable arc interruption performance
- Suitable for both industrial distribution and utility applications
Design Advantages
- Withdrawable breaker truck enabling safe inspection and servicing
- Front access for normal operation with optional rear access for maintenance
- Expandable panel configuration for future system extensions
- Standardized modular construction for easier integration with existing switchgear
- Optimized layout for improved heat dissipation and electrical insulation
Compared to SF₆ Gas Switchgear
- No greenhouse gas usage
- Eliminates gas pressure monitoring
- Lower environmental impact
- Reduced maintenance requirements
Compared to Oil Circuit Breakers
- No oil leakage or fire risk
- Higher switching speed
- Longer service life
- Minimal maintenance
Compared to Fixed Breaker Panels
- Withdrawable breaker simplifies maintenance
- Testing can be performed without disconnecting power cables
- Reduced downtime during service operations
- Improved operational safety
Key Industry Sectors
- Steel and metal processing plants
- Cement manufacturing facilities
- Oil, gas, and petrochemical industries
- Power generation and utility substations
- Infrastructure projects and industrial plants
Common Installations
- Industrial incoming power distribution
- Captive power plant substations
- Transformer feeder protection panels
- Motor feeder panels
- Utility distribution substations
